I built these for my motor build but that money was sunk into my wife's Civic two weeks ago, so I'm putting these up for sale. Thunderstorm heads heavily worked over by yours truly. I'm asking $850 + shipping for the heads and matching manifold.


The details:
I had the port floors on the intake and exhaust ports welded up so I could get a better flowing shape with the ports. The intake floors are very close to XB floors and the exhaust ports are more D shaped. The intake ID at the manifold was increased from 1.675" to 1.770" to port match the included ported Ultima intake manifold. The valves have been sank with a heavy unshroud, along with a 30* squish band at 3.563" diameter (same as a 1250 piston) and .060" decking, to create a highly efficient bathtub shaped combustion chamber with lots of squish surface area when paired with a .300" dome 30* piston. Can also be used with a .200" dome for lower compression and milder cams. Guides are AV&V +.001" bronze manganese. The valves are 5/16" Ferrea 1.900" intake, 1.615" exhaust. I paid close attention to blending the valve seats and rounding the seats and the valves at either sides of the seal band after I lapped the valves, so the flow will be least interrupted at the highest-flowing points (around the valves and seats). Springs are Ferrea .600 with Titanium retainers, with spring height set to the required 1.850". Mind you that's almost $500 in hardware alone.


will fit '86-'03 Sportster and '88-'02 Buell



What you need to run these:
-matching 1250 kit with 30* dome pistons
-.060" shorter pushrods (.040" shorter would also work)
-Mikuni carburetor adapter if running a spigot-mount carb
-clearance rockerboxes for springs
-aftermarket ignition recommended

 

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